sturdiness

the ability to withstand force or stress without being distorted, dislodged, or damaged demonstrated the suitcase's sturdiness by dropping it from a third-floor window Synonyms firmness, soundness, strength, stabilityRelated Words dependability, durability, reliability; solidity, solidness; cohesion, toughnessNear Antonyms insubstantiality, unsoundness, unsubstantiality; weaknessAntonyms insecurity, instability, precariousness, shakiness, unstableness, unsteadiness